Removed contrib.sites.models.RequestSite/get_current_site() aliases.

Per deprecation timeline; refs #21680.

django/contrib/sites/models.py

 from __future__ import unicode_literals
 
 import string
-import warnings
 
 from django.core.exceptions import ImproperlyConfigured, ValidationError
 from django.db import models
 from django.db.models.signals import pre_save, pre_delete
-from django.utils.deprecation import RemovedInDjango19Warning
 from django.utils.encoding import python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
-from .requests import RequestSite as RealRequestSite
-from .shortcuts import get_current_site as real_get_current_site
-
 
 SITE_CACHE = {}
 
@@ -93,21 +88,6 @@ class Site(models.Model):
         return self.domain
 
 
-class RequestSite(RealRequestSite):
-    def __init__(self, *args, **kwargs):
-        warnings.warn(
-            "Please import RequestSite from django.contrib.sites.requests.",
-            RemovedInDjango19Warning, stacklevel=2)
-        super(RequestSite, self).__init__(*args, **kwargs)
-
-
-def get_current_site(request):
-    warnings.warn(
-        "Please import get_current_site from django.contrib.sites.shortcuts.",
-        RemovedInDjango19Warning, stacklevel=2)
-    return real_get_current_site(request)
-
-
 def clear_site_cache(sender, **kwargs):
     """
     Clears the cache (if primed) each time a site is saved or deleted

docs/ref/contrib/sites.txt

@@ -472,11 +472,6 @@ a fallback when the database-backed sites framework is not available.
         Sets the ``name`` and ``domain`` attributes to the value of
         :meth:`~django.http.HttpRequest.get_host`.
 
-    .. deprecated:: 1.7
-
-        This class used to be defined in ``django.contrib.sites.models``. The
-        old import location will work until Django 1.9.
-
 A :class:`~django.contrib.sites.requests.RequestSite` object has a similar
 interface to a normal :class:`~django.contrib.sites.models.Site` object,
 except its :meth:`~django.contrib.sites.requests.RequestSite.__init__()`
@@ -499,11 +494,6 @@ Finally, to avoid repetitive fallback code, the framework provides a
     object or a :class:`~django.contrib.sites.requests.RequestSite` object
     based on the request.
 
-    .. deprecated:: 1.7
-
-        This function used to be defined in ``django.contrib.sites.models``.
-        The old import location will work until Django 1.9.
-
     .. versionchanged:: 1.8
 
         This function will now lookup the current site based on